Definition of the word crash out

The origin of the phrase "crash out" can be traced back to the mid-20th century when it emerged in the context of aviation. At that time, "crash" was commonly used as a verb meaning "to land heavily," often leading to structural damage or failure of the aircraft, which was subsequently referred to as a "crash landing." As aviation terminology spread into other forms of transportation and popular culture, the term "crash" began to be used figuratively in non-aviation contexts. One such usage is "to crash out," which refers to sleeping deeply or heavily. While the exact origin of this specific usage is unclear, it's possible that it arose from the analogy of a person collapsing into a deep sleep, similar to an aircraft touching down heavily after a rigorous flight. In the context of sleep, though, "crash out" implies a haphazard or less-than-ideal descent into slumber, implying that the sleeper may have been pushed past exhaustion transgressing a regular sleep-wake schedule. The phrase has since become part of everyday English, used outside of the aviation context to describe a range of activities from sleeping to crashing out of a social gathering.